// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//

package config

import (
	"bytes"
	"path"
	"text/template"

	"github.com/kumose/kmopt/embed"
	"github.com/kumose/kmopt/pkg/utils"
)

// DatasourceConfig represent the data to generate Datasource config
type DatasourceConfig struct {
	Name      string
	Type      string
	URL       string
	IsDefault bool
}

// NewDatasourceConfig returns a DatasourceConfig
func NewDatasourceConfig(clusterName, url string) *DatasourceConfig {
	return &DatasourceConfig{
		Name:      clusterName,
		Type:      "prometheus",
		URL:       url,
		IsDefault: true,
	}
}

// WithName sets name of datasource
func (c *DatasourceConfig) WithName(name string) *DatasourceConfig {
	c.Name = name
	return c
}

// WithType sets type of datasource
func (c *DatasourceConfig) WithType(typ string) *DatasourceConfig {
	c.Type = typ
	return c
}

// WithIsDefault sets if datasource is default
func (c *DatasourceConfig) WithIsDefault(isDefault bool) *DatasourceConfig {
	c.IsDefault = isDefault
	return c
}

// ConfigToFile write config content to specific path
func (c *DatasourceConfig) ConfigToFile(file string) error {
	config, err := c.Config()
	if err != nil {
		return err
	}
	return utils.WriteFile(file, config, 0755)
}

// Config generate the config file data.
func (c *DatasourceConfig) Config() ([]byte, error) {
	fp := path.Join("templates", "config", "datasource.yml.tpl")
	tpl, err := embed.ReadTemplate(fp)
	if err != nil {
		return nil, err
	}

	tmpl, err := template.New("Datasource").Parse(string(tpl))
	if err != nil {
		return nil, err
	}

	content := bytes.NewBufferString("")
	if err := tmpl.Execute(content, map[string]any{
		"Datasources": []any{c},
	}); err != nil {
		return nil, err
	}

	return content.Bytes(), nil
}
